physical change - a change in which the properties of a substance change but the identityof the substance always remains the same; a change in the size or state of a substance, usually from temperature, pressure or motion
chemical change - a change in which the identity of a substance changes due to its chemical properties and forms a new substance or substances
element - a substance composed of atoms having an identical number of protons in each nucleus
compound - a substances whose molecules contain atoms from different elements
chemical symbol - a one- or two-letter abbreviation for an element's name (O - oxygen)
chemical formula - a set of symbols that describe the number and kind of elements in a compound (NaCl)
matter- anything that has mass and takes up space
molecule - a particle of matter made up of two or more atoms joined tightly together
physical properties - any characteristic of a substance, such as state, color and volume, that can be observed or measured without changing or attempting to change the material
chemical properties - any characteristic, such as the ability to burn, that allows a substance to change into a new substance with different properties
oxidation - a common form of chemical reaction which is the combination of oxygen with various elements and compounds
tarnish- a thin layer of corrosion that forms over copper, brass, silver, aluminum and other similar metals as their outermost layer undergoes a chemical reaction
rust- corrosion that forms on iron and iron-coated materials as it undergoes a chemical reaction
exothermic- describes a process which RELEASES thermal (heat) energy
endothermic- describes a process which ABSORBS thermal (heat) energy
6.5c: Students can differentiate between elements and compounds on the most basic level.
6.5d: Students can identify the formation of a new substance due to a chemical change.
Guiding Questions
1. What is the difference between elements and compounds?
2. How is chemical change identified?
3. How can scientists determine whether a new substance is formed during a reaction?
REVIEW GAME
VOCABULARY
physical change - a change in which the properties of a substance change but the identityof the substance always remains the same; a change in the size or state of a substance, usually from temperature, pressure or motion
chemical change - a change in which the identity of a substance changes due to its chemical properties and forms a new substance or substances
element - a substance composed of atoms having an identical number of protons in each nucleus
compound - a substances whose molecules contain atoms from different elements
chemical symbol - a one- or two-letter abbreviation for an element's name (O - oxygen)
chemical formula - a set of symbols that describe the number and kind of elements in a compound (NaCl)
matter - anything that has mass and takes up space
molecule - a particle of matter made up of two or more atoms joined tightly together
physical properties - any characteristic of a substance, such as state, color and volume, that can be observed or measured without changing or attempting to change the material
chemical properties - any characteristic, such as the ability to burn, that allows a substance to change into a new substance with different properties
oxidation - a common form of chemical reaction which is the combination of oxygen with various elements and compounds
tarnish- a thin layer of corrosion that forms over copper, brass, silver, aluminum and other similar metals as their outermost layer undergoes a chemical reaction
rust- corrosion that forms on iron and iron-coated materials as it undergoes a chemical reaction
exothermic- describes a process which RELEASES thermal (heat) energy
endothermic- describes a process which ABSORBS thermal (heat) energy
Important Links
Study Jams: Elements and Compounds
Bite Size Chemistry
Compounds - Chem4Kids
How it Works: Elements and Compounds
A Closer Look at Physical and Chemical Changes
Evidence of Chemical Changes
Models of Molecules
In Class Investigations
Hot Pack
Copper from Aluminum
Rotten Egg Gas
Instant Sunshine
Other Reactions
Color Change Reaction
Sugar Snake
Oxidation Explosion
Underwater Fireworks - Oxidation
Elephant Toothpaste
Orange Sorbet
Sizzling Sunset
Smokescreen On Demand
Surprise Fire
Genie in the Bottle
Songs and Games
Element Lab
Chemistry Rags to Riches
Alien Juice Bar (pH and Chemical Change)
Kitchen Chemistry
Reversible and Irreversible Changes
Periodic Table Game